Digital resistive type touch panel and fabrication method thereof

• US 7,355,592 B2
• Filed: 10/08/2003
• Issued: 04/08/2008
• Est. Priority Date: 12/24/2002
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Hong, Hee Jung, Park, Hee Jeong
• Primary Examiner(s): Liang; Regina
• Application Number:
  US10/680,202
• Publication Number:
  US 20050190161A1
• Time in Patent Office: 1,644 Days
• Field of Search: 345/173, 345/174, 178/180.3, 178/18.06
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer

Abstract

A display device integrated with a touch panel is disclosed, which can use various types of input devices. Thus, in addition to conductive devices, a gloved hand or a non-conductive stylus pen can be used as an input. The touch panel includes a supporting substrate; a first transparent conductive layer having a first electrode for applying a voltage to the supporting substrate; a second transparent conductive layer having a second electrode and facing the first transparent conductive layer; an adhesive for attaching the first and second transparent conductive layers to each other; and a passivation film on an outer surface of the second transparent conductive layer.

Claims

1. A capacitive-type touch panel comprising:

a supporting substrate;

a first transparent conductive layer on an entire inner surface of the supporting substrate;

a first electrode on the first transparent conductive layer for applying a voltage having a high frequency to the first transparent conductive layer, wherein the first electrode is metal and is formed at each of four corners of the first transparent conductive layer;

a second transparent conductive layer facing the first transparent conductive layer;

a second electrode on an inner surface of the second transparent conductive layer, the second electrode formed at a corner of the second transparent conductive layer and connected to an external ground voltage or a metal shielding plate;

an adhesive between the first and second transparent conductive layers; and

a passivation film on an outer surface of the second transparent conductive layer.

2. The touch panel of claim 1, further comprising a plurality of dot spacers formed at fixed intervals on the first transparent conductive layer.

3. The touch panel of claim 1, further comprising a transparent conductive layer formed below the supporting substrate.

4. The touch panel of claim 1, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

5. The touch panel of claim 4, wherein the adhesive includes an insulating material.

6. The touch panel of claim 1, wherein the supporting substrate includes a glass.

7. The touch panel of claim 1, wherein the supporting substrate is a transparent film.

8. The touch panel of claim 1, wherein the passivation film is formed of a transparent plastic material.

9. The touch panel of claim 8, wherein the passivation film is a Polyethylene Terephtalate film.

10. The touch panel of claim 1, further comprising a current sensor connected to the first electrode.

11. A fabrication method of a capacitive-type touch panel comprising:

providing a supporting substrate;

forming a first transparent conductive layer on an entire inner surface of the supporting substrate;

forming a first metal electrode at each of four corners of the first transparent conductive layer for applying a voltage having a high frequency to the first transparent conductive layer;

forming a second transparent conductive layer facing the first transparent conductive layer;

forming a second metal electrode on an inner surface of the second transparent conductive layer, the second metal electrode formed at a corner of the second transparent conductive layer and connected to an external ground voltage or a metal shielding plate;

attaching the first and second transparent conductive layers to each other using an adhesive; and

forming a passivation film on an outer surface of the second transparent conductive layer.

12. The method of claim 11, further comprising, forming a plurality of dot spacers at fixed intervals on the first transparent conductive layer.

13. The method of claim 11, further comprising, forming a transparent conductive layer below the supporting substrate.

14. The method of claim 11, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

15. The method of claim 11, wherein the supporting substrate is a glass or a film.

16. The method of claim 11, wherein the passivation film is a Polyethylene Terephtalate film.

17. The method of claim 11, further comprising a current sensor connected to the first electrode.

18. A liquid crystal display device integrated with a capacitive-type touch panel comprising:

the capacitive-type touch panel comprising;

a supporting substrate having first and second surfaces,

a first transparent conductive layer on the entire first surface of the supporting substrate, the first transparent conductive layer having a first electrode for applying a voltage to the first transparent conductive layer, wherein the first electrode is metal and is formed at each of four corners of the first transparent conductive layer,

a second transparent conductive layer facing the first transparent conductive layer,

a second electrode on an inner surface of the second transparent conductive layer, the second electrode formed at a corner of the second transparent conductive layer and connected to an external ground voltage or a metal shielding plate,

an adhesive between the first and second transparent conductive layers, and

a passivation film on an outer surface of the second transparent conductive layer; and

the liquid crystal display device on the second surface of the supporting substrate of the touch panel, the liquid crystal display device comprising;

a first substrate having a plurality of thin film transistors,

a second substrate having a color filter and facing the first substrate, and

a liquid crystal layer between the first and second substrates.

19. The device of claim 18, further comprising a plurality of dot spacers formed at fixed intervals on the first transparent conductive layer.

20. The device of claim 18, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

21. The device of claim 20, wherein the adhesive includes an insulating material.

22. The device of claim 18, wherein the supporting substrate includes a glass.

23. The device of claim 18, wherein the passivation film is formed of a transparent plastic material.

24. The device of claim 23, wherein the passivation film is a Polyethylene Terephtalate film.

25. The device of claim 18, further comprising a current sensor connected to the first electrode.

26. A method for fabricating a liquid crystal display device integrated with a capacitive-type touch panel comprising:

providing a supporting substrate having first and second surfaces;

forming a first transparent conductive layer on the entire first surface of the supporting substrate, the first transparent conductive layer having a first electrode for applying a voltage having a high frequency to the first transparent conductive layer, wherein the first electrode is metal at each of four corners of the first transparent conductive layer;

forming a second transparent conductive layer facing the first transparent conductive layer;

forming a second electrode on an inner surface of the second transparent conductive layer, the second electrode formed at a corner of the second transparent conductive layer and connected to an external ground voltage or a metal shielding plate;

attaching the first and second transparent conductive layers to each other using an adhesive;

forming a passivation film on an outer surface of the second transparent conductive layer; and

forming the liquid crystal display device on the second surface of the supporting substrate of the touch panel, the method for fabricating the liquid crystal display device comprising;

preparing a first substrate having a plurality of thin film transistors, preparing a second substrate having a color filter and facing the first substrate, and

providing a liquid crystal layer between the first and second substrates.

27. The method of claim 26, further comprising, forming a plurality of dot spacers at fixed intervals on the first transparent conductive layer.

28. The method of claim 26, further comprising, forming a transparent conductive layer below the supporting substrate.

29. The method of claim 26, wherein the adhesive is formed along a circumference of the first and second transparent conductive layers.

30. The method of claim 26, wherein supporting substrate is a glass or a film.

31. The method of claim 26, wherein the passivation film is a Polyethylene Terephtalate film.

32. The method of claim 26, further comprising a current sensor connected to the first electrode.